The Hessian Fly and How to Prevent Losses from It Page: 3
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THE HESSIAN FLY' AND HOW TO PRE-
VENT LOSSES FROM IT.
Economic importance---- ---.. --- 3 Effect of the weather on the Hessian
Regions where the Hessian fly is fly-----...--------------------- 10
most injurious_ -------- ---- 3 The so-called bioclimatic law and its
Nature of injury------------______ 4 application in Hessian-fly control_ 11
Life history-------- ------ 7 Natural enemies- 12
Description and location of various Control measures .--. ---- 13
stages-..------------------------ 8 Summary------------------------ 16
IN THE principal winter wheat-growing regions of the United
States the Hessian fly is the most injurious insect enemy of the
wheat crop. It is generally distributed throughout this territory,
except in the extreme south, and is always alert to take advantage
of favorable weather and crop conditions to multiply rapidly. Dam-
age amounting to at least $100,000,000 in a single year has been
known to occur from its work.
The Hessian fly is chiefly injurious to wheat, but at times injures
barley and rye to a lesser extent. It does not attack oats at all. In
a few instances, apparently, the insect has been reared from grasses,
but it is not known to infest them except under unusual conditions.
REGIONS WHERE THE HESSIAN FLY IS MOST
The preferred nome of the Hessian fly, generally speaking, is that
portion of the country lying east of the one hundredth meridian and
between the thirty-fifth and forty-fifth parallels of north latitude.
It occurs outside of this area, but usually not as a serious menace
to the wheat. The fly also is found in the Pacific Coast region,
but is not nearly so destructive as it is east of the Rocky Mountains.
The Hessian fly is found in the Dominion of Canada from Prince
Edward Island to Indian Head, Saskatchewan, and also in British
1 Phytophaga destructor Say; order Diptera, family Itonididae.
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Walton, William Randolph, 1873-1952. The Hessian Fly and How to Prevent Losses from It, pamphlet, 1924; Washington D.C.. (digital.library.unt.edu/ark:/67531/metadc97227/m1/3/: accessed February 23, 2019), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.